From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: In some countries, concubinage is marriage of an inferior kind, or performed with less solemnity than a true or formal marriage; or marriage with a woman of inferior condition, to whom the husband does not convey his rank or quality. Under Roman law, it was the living of a man and woman in sexual relations without marriage, but in conformity with local law.
From WordNet (r) 3.0 (2006) [wn]:
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